Expansion-bolt.



|. GISSER.

EXPANSION BOLT.

APPLICATION FILED JUNE 2. I9I6.

1,1 98,7 1 9. latvntvd Sept. 19, 1916.

UNITED s'rArEs PATENT OFFICE.

ISIDOR GISSER, OF NEW YORK, N. Y., A SSIGNOR OF ONE-HALF TO 'MEYERGORIN, OF BROOKLYN, NEW YORK.

EXPANSION-BOLT.

Specification of Letters Patent.

Patented Sept. 19, 1916.

To all whom it may concern:

Be it known that I, Isroon Grssnn, a subject of the Czar of Russia, anda resident of New York, in the county of New York, State of New York,have inventedcertain new and useful Improvements in Expansion assembledtogether, will not become sepa-.

rated and lost during shipment.

One of the important features of my device is that at the side of one ofthe segments of the outer sleeve, a curved socket is provided into whicha curved lug projecting from the side of the second segment is adaptedto fit, providing thereby a swingingjoint. The above joint is placednear the top of the split sleeve permitting thereby a considerableamount of expansion ofthe sleeve without binding on the bolt insertedinside of it. The two segments are held together by means of any of thethree alternate methods shown, each one of which will keep the twosegments of the sleeve permanently locked after the expansion bolt isinserted into the prepared hole in wood or masonry.

Other novel features of my device will be apparent from the detaileddescription and the accompanying drawing forming a part of thisspecification in which like numerals designate similar parts in all theviews and in which Figure l is a side view of an assembled expansionbolt placed inside of a prepared hole in wood or masonry. Fig. 2 is alongitudinal section of one of the segments of the split sleeve andtaken on line 22 of Fig.5. Fig. 3 is a longitudinal section of thesecond segment of the split sleeve and taken on line 33 of Fig. 6. Fig.4 is a cross section of the bolt taken on line 4-4 of Fig. 1. Fig. 5 isan end view of one of the segments of the split sleeve looking in thedirection of line 55 of Fig. 2. Fig. 6

is a cross section on line 66 of Fig. 3.

- Fig. 7 is a partial side view of two segments of-a split sleeveshowing an alternate method of locking the segments together. Fig. 8 isa cross section taken on line 88 of Fig. 7. Fig. 9 is a partial sideview of two segments of a split sleeve showing another alternate methodof locking the segments together. Fig. 10 is an end view of the sleeveshown in Fig. 9. Fig. 11 is a side view of the tapering nut. Fig. 12 isa top view of the tapering nut. Fig. 13 is a cross section taken on line13--13 of Fig. 1.

Referring to the drawings, the two segments 1 and 2, together "forming asplit cylindrical sleeve and preferably made of malleable iron havetheir outer surface formed into a connected series of truncated cones,or roughened in any other suitable manner, thereby preventing thewithdrawal of the bolt from the hole after the sleeve has expanded. Thetwo segments of the sleeve are cut away as shown forming two interveningtapering slots 3 adapted to receive the projecting lugs 5 on thetapering nut 4;. The two curved sockets 6 provided near the top of thesides of the segment 1, are adapted to receive the mating curved lugs 7projecting from the sides of'the segment 2. The metal bands 8 preferablycast integrally with the segment 1 are bent around the segment 2 untilthey fit snugly into the groove 10 at the top of thelatter, while thehook ends 9 of the bands 8 engage with the radial slot 11 in the segment2 as is clearly shown in Fig. 4. The groove 10 is made wider than thestrap 8 and is inclined as is clearly shown in Fig. l in order to permitthe expansion of the sleeve. The tapering nut 4 is inserted between thetwo segments 1 and 2 of the sleeve. The bolt 12 is screwed into the nut4 while the latter is prevented from rotating by means of the lugs 5engaging with the sides of the'tapering slots 3.

Referring-to Fig. 1 it will now be evident that if the assembledexpansion bolt be inserted into a hole 13, and the bolt 12 turned, thehead of the bolt will bear against the surface of the plate 14 while thetapering nut 4 will be moved upwardly. The outer surface of the nut 4 bybearing against the inclined inner surfaces of the segments 1 and 2 ofthe split sleeve, will cause the latter to expand, while the curved lug7 will rotate in the curved socket 6. After the split sleeve hasexpanded, the bolt will be securely locked in place.

A modified method of locking the two segments of the split sleevetogether is shown in Figs. 7 and 8. The segments 15 and 16 of a splitsleeve are similar to the segments 1 and 2 respectively except thatinstead of having the bands 8 cast integrally with the segment 1, thesegment 15 is provided with a groove 17 while the segment 16 is providedwith a similar groove 17 and a slot 19 similar to slot 4 in segment 2. Aflexible metal band 18 provided with hook ends 20 is adapted to fit intothe groove 17 in the segments 15 and 16 while the hook ends 20 engagewith the slot 19 thereby holding the segments 15 and 16 together.

Another method of holding the segments of the split sleeve together isshown in Figs. 9 and 10. The segments 21 and 22 are similar to thesegments 1 and 2 except that instead of using a band to hold thesegments together, the segment 22 is provided with pins 23 which engagewith corresponding holes in the segment 21, thereby forming a pivotedjoint as is clearly shown in Fig. 10.

Having thus described my invention, I claim as new and wish to secure byLetters Patent:

1. An expansion bolt comprising, a split sleeve having a radial slotnear its top, one of the segments of said sleeve having a curved socketnear its top, the other segment of said sleeve having a curvedprojecting lug adapted to fit into the socket of the first segment,means for keeping said lug and socket in engagement but permittingrelative motion of the two, comprising a band having hook ends adaptedto envelop said sleeve While said hook ends engage with said radialslot, a tapering nut fitting inside of said sleeve, means for lockingsaid nut against rotation relative to the sleeve, and a bolt fittinginside of said sleeve and engaging with said nut, whereby the sleeve isexpanded when the tapering nut is pulled into said sleeve.

2. An expansion bolt comprising, a split sleeve, one of the segments ofsaid sleeve having an annular groove near its top and a radial slotwithin said groove, means for holding the two segments of the sleevetogether comprising two bands having hook ends and cast integrally withthe second segment of the sleeve adapted to be bent over ISIDOR GISSER.

